Update Soy to latest version
Update Soy to latest version

Upstream is having some difficulty upgrading Maven artifacts, so I
compiled at head and pushed a binary to the Gerrit bucket (sans
pom.xml). We're using SHA-1 version numbers now, which shouldn't be a
problem.

Change-Id: Ia2a1be6058c1fc004eaf03424e6309f2647544b4

estebank/gitiles